Schlüter®-TROBA-STELZ-DR | Schlüter-Systems


Application and Function

Schlüter-TROBA-STELZ-DR are plastic formwork rings of non-rotting polyethylene that are used as installation aids for large format pavers on balconies and terraces.

The 2 mm high plastic rings are installed on top of the drainage mat Schlüter-TROBAPLUS 8G at the intersection points of the pavers as single-use or reusable formwork rings and are filled with thin-bed mortar.

Following the installation of the thin-bed mortar, the corners of the pavers are aligned over the thin-bed mortar rings and set to the right height.

The joints remain open to ensure that the finished covering drains through the joints between the pavers to the drainage level of the Schlüter-TROBA-PLUS 8G membrane. The drainage water is routed to the gutters by gravity, depending on the installed slope.




  1. The formwork rings Schlüter-TROBA-STELZ-DR are installed on top of the passive capillary drainage mat Schlüter-TROBA-PLUS 8G, which is loosely laid over sloped ( ≥1.5%), weight-bearing waterproofing membrane.
  2. The Schlüter-TROBA-STELZ-DR formwork rings are installed at the intersection points of the pavers and filled with thinbed mortar.

    The mortar should be filled slightly over the edge of Schlüter-TROBA-STELZ-DR to allow for proper height adjustment of the pavers. As an alternative, Schlüter-TROBA-STELZ-DR may also be used as a marking template for the thin-bed mortar and reused in other projects.
  3. In case of height discrepancies, several Schlüter-TROBA-STELZ-DR formwork rings may be stacked on top of one another for levelling.



Schlüter-TROBA-STELZ-DR is made of non rotting polyethylene. The plastic rings have a diameter of 23 cm and a height of 2 mm.

Material properties and areas of application

Schlüter-TROBA-STELZ-DR are formwork rings used to create thinbed pedestals over the drainage membrane Schlüter-TROBA-PLUS 8G for the installation of pavers on balconies and terraces.

The material is non rotting, physiologically harmless and may be used with bitumen. 



Schlüter-TROBA-STELZ-DR is non rotting and requires no special maintenance or care.

Natural shifts may occur in paver coverings that are loosely installed on paver supports due to one-sided or corner loads.




package = 10 units




Enjoy our videos showing the product itself as well as possible areas of application.

Balcony assembly: Loose installation of natural stone on mortar casting mould rings with drainage

Contact Schlüter-Systems Ltd

Units 3-5 Bardon 22,
Beveridge Lane, Coalville,
Leicestershire, LE67 1TE
Phone: +44 (0) 1530 813396

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Further information

on our products and specifications can be found here:

Legend "Products"

We use the following symbols and abbreviations to illustrate our price charts.

image image

= new products

= radius perforation available   


H = height
L = length
B = width

PL = euro pallet 
KV = case packaging 
BV = bundle (there is a 10 item bundle packaging for all the profile types)
P = box packaging 
R = roll
St. = unit